Direct Synthesis of 3,5-Dinitropyrazole Catalyzed by Newly Sulfated Nanosolid Superacid TiO₂/ SO

Abstract:

The newly sulfated nanosolid superacid TiO₂/SO₄ prepared by sol-gel method was broadly characterized by acid base titration, XRD and TEM, which identified that the superfine solid TiO₂/SO₄ showing good dispersibility with average size of 27 nm belongs to kind of crystalline nanoparticles. With the help of the catalyst TiO₂/SO₄, the optimal reaction condition for direct transformation of pyrazole and nitrosonitric acid into 3, 5-Dinitropyrazole was n (pyrazol)=0.10 mol, m (TiO₂/SO₄ )＝1.5g, V(n-octannol)＝90mL, and V(nitrosonitric acid)＝50mL. Moreover, the optimal yield of the catalytic reaction reached up to 59.4% when the reaction time is 7 hours. The nanosolid superacid catalyst is still of high activity after regenerating eight times by calcination at 600^。C.

• Periodical: Advanced Materials Research (Volumes 391-392)
• Pages: 1296-1301
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.391-392.1296
• Online since: December 2011
• Authors: Li Min Xi, Xin Xin Zhang
• Keywords: 5-Dinitropyrazole, Catalysis, Nanosolid Superacid, Nitration

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